More consistent $ escapes

utils.sh

@@ -17,7 +17,7 @@ upgrade() {
 
 # @arg $1 packages to install
 install() {
-    sudo apt-get install -y $1
+    sudo apt-get install -y "$1"
 }
 
 # @arg $1 repository to add
@@ -27,13 +27,13 @@ app_ppa() {
 
 # @arg $1 url to add
 add_key() {
-    curl -fsSL $1 | sudo apt-key add -
+    curl -fsSL "$1" | sudo apt-key add -
 }
 
 # @arg $1 URL to run
 # @arg $2 binary to use
 run() {
-    curl -fsSL $1 | $2
+    curl -fsSL "$1" | "$2"
 }
 
 # Symlink contents of source folder to target
@@ -41,7 +41,7 @@ run() {
 # @arg $1 source folder
 # @arg $2 target folder
 link_folder() {
-    cp -srf $1 $2
+    cp -srf "$1" "$2"
 }
 
 indent() { sed 's/^/  /'; }